feat(mcp): add trace metadata to search and fetch responses (YEH-007)#12
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Add McpTrace struct with trace_id, index_fingerprint, strategy, and expansion_path to every MCP response. Trace IDs use nanosecond timestamp + FNV for uniqueness; index fingerprints hash indexed_at, version, and file count for determinism. Stored in artifacts so fetch inherits the fingerprint from search.
Commit squash-scope reviewRange: Heuristic candidatesNo clear squash candidates found from overlap or message-prefix heuristics. SQUASH_SCOPE_NEEDS_REWRITE=0 |
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Summary
McpTracestruct (trace_id,index_fingerprint,strategy,expansion_path) to every MCP search and fetch response for request-level traceabilityindexed_at+version+ file count for determinismindex_fingerprintin artifacts so fetch inherits from search without re-loading the forward indexTest plan
test_compute_index_fingerprint_deterministic,test_compute_index_fingerprint_changes_with_index,test_generate_trace_id_format)tracefields in search and fetch responsestracein stdio structured contenttrace_id,index_fingerprint, andstrategyin both search and fetch outputcargo clippy -- -D warningsclean